• https://www.ebay.com/itm/232825859958

• https://www.ebay.com/itm/RetroFun-Twin-Connect-2x-Retro-joysticks-to-PC-Pegasus-Sega-Atari-Commdore/232825843831

Files storage (updater, configurator, instructions etc):

• https://drive.google.com/drive/folders/1liT12FRtot6ySOGx6-XNP2GA-ugKfOXf

RETROFUN Joystick Adapters (DB9) INTERFACE MANUAL (PDF)

• retrofun_joystickadapters_db9_-manual.pdf

Firmware upgrading procedure (official video)

• https://youtu.be/V9Ds2-qgEjg

RetroFun Twin C64Mini testing both joystick ports (official video)

• https://youtu.be/X2fwb47jppY

Related thread at TheC64 Community forum:

• http://thec64community.online/thread/202/retrofun-db9-joystick-adapter-working

Old information page:

• http://electronica4u.com/